Subsoiler



use, and Figure UNITED STATES PATENT OFFICE.

SUBSOILER.

Specication of Letters Patent.

Patented Jan. 17, 1922.

Application led December 4, 1920. Serial No. 428,371.

To'v all whom it may concern.'

e it known that I, Jnss F. BELKNAP, a citizen of the United States, andresident of range Cove, county of Fresno, State of California, haveinvented a new and useful Improvement'in Subsoilers, of which thefollowing is a specification.

e present invention, While relating to subsoilers or harroWs, hasreference more particularly to a tooth or blade for such implements.

The primary object of the invention is to provide an improved tooth ofthe character described, Which will carry out its intended use with thegreatest of efficiency.

more specific object of the invention is to provide a tooth for use insubsoiling or breaking up hardpan earth which Will be rugged inconstruction, yet light in weight, and unusually durable regardless ofthe hardened condition of the soil surface with which it is used.

With these and further objects is view, the invention will be morereadily understood upon reference to the accompanying drawing, in whichFigure l is a perspective view of the tooth; Figure 2 is a sideeleva-tion partly in section, showing the position of the tooth relativeto the ground surface when in 3 is a cross-'section on the line 3 3,Figure 2.

It is of course Well-known that teeth of subsoilers, harrows and thelike are arranged in gang formation on a suitable drag frame; however,in so far as concerns the salient features of the present invention,only one of the teeth has been used for the purpose of illustration, asthe invention resides in the tooth per se rather than in any detailedconstruction of the drag frame.

The tooth represents a rectangular shaped piece of metal (5) comprisingthe mounting end, having an equal thickness for a. portion of itslength, With the soil-engaging point or end thereof cupped, rorspoon-shaped, as at 6) With the back'thereof rounded as at (7) andterminating, together with the spoonshaped front, in a relatively sharppoint (8) the thickness of the spoon-shaped end increasing from thepoint (8) slightly beyond the middle of the rounded back (7) and thengradually diminishing in thickness and terminating in a length of equalthickness as above mentioned.

he tooth may be mounted to any suitable frame, such as (9), which mayhave a bar as at (l0) With openings therethrough and openings (ll) inthe tooth corresponding to the openings in the bar, so that bolts or thelike (l2) may be used as a fastening means. he openings (ll) in thetooth are countersunk on one side to receive the heads of the bolts.

The tooth, or teeth, as there may be a number of them, may be made oftool steel, with the point, or spoon-shaped end hardened so that thesame may be effectively used Without bending or breaking on hardpan topsoils.

By producing the cutting or soil-engaging end of the tooth in this Way,the same may be made thinner Without sacrilicing strength anddurability, which is highly desirable in implements of this kind. It isto be noted that the bar (l0) overlies substantially that part of thetooth Which isv oi equal thickness, Whereas the increased thickness dueto the peculiar shape of the end starts near the end of the bar, and inthis Way any tendency of the tooth to bend at any point throughout itslength is overcome.

It is of course obvious that the spoon (6) of the cutting edge is facedtoward the direction of draft, With the tooth mounted at an angle to theground surface.

I claim:

A subsoiler tooth Wit i its opposite end terminating spoon midway of itslower edge and the beginning of the mounting end, the thickness of thematerial at the greatest transverse dimension of the spoon shaped soilengaging device being greater than that of the mounting end, and themounting end adapted to be to a frame member substantially throughoutits entire length.

JESS F. BELKNAP.

